StabilizedFluxComputeKernel.hpp

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/*
 * ------------------------------------------------------------------------------------------------------------
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 * Copyright (c) 2016-2024 Lawrence Livermore National Security LLC
 * Copyright (c) 2018-2024 Total, S.A
 * Copyright (c) 2018-2024 The Board of Trustees of the Leland Stanford Junior University
 * Copyright (c) 2023-2024 Chevron
 * Copyright (c) 2019-     GEOS/GEOSX Contributors
 * All rights reserved
 *
 * See top level LICENSE, COPYRIGHT, CONTRIBUTORS, NOTICE, and ACKNOWLEDGEMENTS files for details.
 * ------------------------------------------------------------------------------------------------------------
 */
 
#ifndef GEOS_PHYSICSSOLVERS_FLUIDFLOW_SINGLEPHASE_STABILIZEDFLUXCOMPUTEKERNEL_HPP
#define GEOS_PHYSICSSOLVERS_FLUIDFLOW_SINGLEPHASE_STABILIZEDFLUXCOMPUTEKERNEL_HPP
 
#include "physicsSolvers/fluidFlow/kernels/singlePhase/FluxComputeKernel.hpp"
 
namespace geos
{
 
namespace stabilizedSinglePhaseFVMKernels
{
 
/******************************** FluxComputeKernel ********************************/
 
template< integer NUM_EQN, integer NUM_DOF, typename STENCILWRAPPER >
class FluxComputeKernel : public singlePhaseFVMKernels::FluxComputeKernel< NUM_EQN, NUM_DOF, STENCILWRAPPER >
{
public:
 
  template< typename VIEWTYPE >
  using ElementViewConst = ElementRegionManager::ElementViewConst< VIEWTYPE >;
 
  using AbstractBase = singlePhaseFVMKernels::FluxComputeKernelBase;
  using DofNumberAccessor = AbstractBase::DofNumberAccessor;
  using SinglePhaseFlowAccessors = AbstractBase::SinglePhaseFlowAccessors;
  using SinglePhaseFluidAccessors = AbstractBase::SinglePhaseFluidAccessors;
  using PermeabilityAccessors = AbstractBase::PermeabilityAccessors;
 
  using StabSinglePhaseFlowAccessors =
    StencilAccessors< fields::flow::macroElementIndex,
                      fields::flow::elementStabConstant,
                      fields::flow::pressure_n >;
 
  using StabSinglePhaseFluidAccessors =
    StencilMaterialAccessors< constitutive::SingleFluidBase,
                              fields::singlefluid::density_n >;
 
  using AbstractBase::m_dt;
  using AbstractBase::m_rankOffset;
  using AbstractBase::m_ghostRank;
  using AbstractBase::m_dofNumber;
  using AbstractBase::m_gravCoef;
  using AbstractBase::m_pres;
 
  using Base = singlePhaseFVMKernels::FluxComputeKernel< NUM_EQN, NUM_DOF, STENCILWRAPPER >;
  using Base::numDof;
  using Base::numEqn;
  using Base::maxNumElems;
  using Base::maxNumConns;
  using Base::maxStencilSize;
  using Base::m_stencilWrapper;
  using Base::m_seri;
  using Base::m_sesri;
  using Base::m_sei;
 
  FluxComputeKernel( globalIndex const rankOffset,
                     STENCILWRAPPER const & stencilWrapper,
                     DofNumberAccessor const & dofNumberAccessor,
                     SinglePhaseFlowAccessors const & singlePhaseFlowAccessors,
                     StabSinglePhaseFlowAccessors const & stabSinglePhaseFlowAccessors,
                     SinglePhaseFluidAccessors const & singlePhaseFluidAccessors,
                     StabSinglePhaseFluidAccessors const & stabSinglePhaseFluidAccessors,
                     PermeabilityAccessors const & permeabilityAccessors,
                     real64 const & dt,
                     CRSMatrixView< real64, globalIndex const > const & localMatrix,
                     arrayView1d< real64 > const & localRhs )
    : Base( rankOffset,
            stencilWrapper,
            dofNumberAccessor,
            singlePhaseFlowAccessors,
            singlePhaseFluidAccessors,
            permeabilityAccessors,
            dt,
            localMatrix,
            localRhs ),
    m_pres_n( stabSinglePhaseFlowAccessors.get( fields::flow::pressure_n {} ) ),
    m_dens_n( stabSinglePhaseFluidAccessors.get( fields::singlefluid::density_n {} ) ),
    m_macroElementIndex( stabSinglePhaseFlowAccessors.get( fields::flow::macroElementIndex {} ) ),
    m_elementStabConstant( stabSinglePhaseFlowAccessors.get( fields::flow::elementStabConstant {} ) )
  {}
 
  struct StackVariables : public Base::StackVariables
  {
public:
 
    GEOS_HOST_DEVICE
    StackVariables( localIndex const size, localIndex numElems )
      : Base::StackVariables( size, numElems )
    {}
 
    using Base::StackVariables::stencilSize;
    using Base::StackVariables::numFluxElems;
    using Base::StackVariables::transmissibility;
    using Base::StackVariables::dTrans_dPres;
    using Base::StackVariables::dofColIndices;
    using Base::StackVariables::localFlux;
    using Base::StackVariables::localFluxJacobian;
 
    real64 stabTransmissibility[maxNumConns][2]{};
 
  };
 
  GEOS_HOST_DEVICE
  void computeFlux( localIndex const iconn,
                    StackVariables & stack ) const
  {
 
    m_stencilWrapper.computeStabilizationWeights( iconn,
                                                  stack.stabTransmissibility );
 
    // ***********************************************
    // We call the base computeFlux,
    //
    // We use the lambda below to compute stabilization terms
    Base::computeFlux( iconn, stack, [&] ( localIndex const (&k)[2],
                                           localIndex const (&seri)[2],
                                           localIndex const (&sesri)[2],
                                           localIndex const (&sei)[2],
                                           localIndex const connectionIndex,
                                           real64 const alpha,
                                           real64 const mobility,
                                           real64 const potGrad,
                                           real64 const fluxVal,
                                           real64 const (&dFlux_dP)[2] )
    {
 
      GEOS_UNUSED_VAR( alpha, mobility, potGrad, fluxVal, dFlux_dP );
 
      real64 stabFlux{};
      real64 dStabFlux_dP[2]{};
 
      real64 const stabTrans[2] = { stack.stabTransmissibility[connectionIndex][0],
                                    stack.stabTransmissibility[connectionIndex][1] };
 
 
      real64 dPresGradStab = 0.0;
      integer stencilMacroElements[2]{};
 
      // Step 1: compute the pressure jump at the interface
      for( integer ke = 0; ke < stack.numFluxElems; ++ke )
      {
        localIndex const er  = seri[ke];
        localIndex const esr = sesri[ke];
        localIndex const ei  = sei[ke];
 
        stencilMacroElements[ke] = m_macroElementIndex[er][esr][ei];
 
        // use the jump in *delta* pressure in the stabilization term
        dPresGradStab += m_elementStabConstant[er][esr][ei] * stabTrans[ke] * (m_pres[er][esr][ei] - m_pres_n[er][esr][ei]);
      }
 
      // Step 2: compute the stabilization flux
      integer const k_up_stab = (dPresGradStab >= 0) ? 0 : 1;
 
      localIndex const er_up_stab  = seri[k_up_stab];
      localIndex const esr_up_stab = sesri[k_up_stab];
      localIndex const ei_up_stab  = sei[k_up_stab];
 
      bool const areInSameMacroElement = stencilMacroElements[0] == stencilMacroElements[1];
      bool const isStabilizationActive = stencilMacroElements[0] >= 0 && stencilMacroElements[1] >= 0;
      if( isStabilizationActive && areInSameMacroElement )
      {
 
        real64 const laggedUpwindCoef = m_dens_n[er_up_stab][esr_up_stab][ei_up_stab][0];
        stabFlux += dPresGradStab * laggedUpwindCoef;
 
        for( integer ke = 0; ke < stack.numFluxElems; ++ke )
        {
          real64 const tauStab = m_elementStabConstant[seri[ke]][sesri[ke]][sei[ke]];
          dStabFlux_dP[ke] += tauStab * stabTrans[ke] * laggedUpwindCoef;
        }
      }
 
      // Step 3: add the stabilization flux and its derivatives to the residual and Jacobian
      integer const eqIndex0 = k[0] * numEqn;
      integer const eqIndex1 = k[1] * numEqn;
 
      stack.localFlux[eqIndex0] +=  stabFlux;
      stack.localFlux[eqIndex1] += -stabFlux;
 
      for( integer ke = 0; ke < stack.numFluxElems; ++ke )
      {
        localIndex const localDofIndexPres = k[ke] * numDof;
        stack.localFluxJacobian[eqIndex0][localDofIndexPres] +=  dStabFlux_dP[ke];
        stack.localFluxJacobian[eqIndex1][localDofIndexPres] += -dStabFlux_dP[ke];
      }
 
    } ); // end call to Base::computeFlux
 
  }
 
protected:
 
  ElementViewConst< arrayView1d< real64 const > > const m_pres_n;
  ElementViewConst< arrayView2d< real64 const > > const m_dens_n;
 
  ElementViewConst< arrayView1d< integer const > > const m_macroElementIndex;
  ElementViewConst< arrayView1d< real64 const > > const m_elementStabConstant;
 
};
 
class FluxComputeKernelFactory
{
public:
 
  template< typename POLICY, typename STENCILWRAPPER >
  static void
  createAndLaunch( globalIndex const rankOffset,
                   string const & dofKey,
                   string const & solverName,
                   ElementRegionManager const & elemManager,
                   STENCILWRAPPER const & stencilWrapper,
                   real64 const dt,
                   CRSMatrixView< real64, globalIndex const > const & localMatrix,
                   arrayView1d< real64 > const & localRhs )
  {
 
    integer constexpr NUM_EQN = 1;
    integer constexpr NUM_DOF = 1;
 
    ElementRegionManager::ElementViewAccessor< arrayView1d< globalIndex const > > dofNumberAccessor =
      elemManager.constructArrayViewAccessor< globalIndex, 1 >( dofKey );
    dofNumberAccessor.setName( solverName + "/accessors/" + dofKey );
 
    using KERNEL_TYPE = FluxComputeKernel< NUM_EQN, NUM_DOF, STENCILWRAPPER >;
    typename KERNEL_TYPE::SinglePhaseFlowAccessors singlePhaseFlowAccessors( elemManager, solverName );
    typename KERNEL_TYPE::SinglePhaseFluidAccessors singlePhaseFluidAccessors( elemManager, solverName );
    typename KERNEL_TYPE::StabSinglePhaseFlowAccessors stabSinglePhaseFlowAccessors( elemManager, solverName );
    typename KERNEL_TYPE::StabSinglePhaseFluidAccessors stabSinglePhaseFluidAccessors( elemManager, solverName );
    typename KERNEL_TYPE::PermeabilityAccessors permeabilityAccessors( elemManager, solverName );
 
    KERNEL_TYPE kernel( rankOffset, stencilWrapper, dofNumberAccessor,
                        singlePhaseFlowAccessors, stabSinglePhaseFlowAccessors, singlePhaseFluidAccessors, stabSinglePhaseFluidAccessors,
                        permeabilityAccessors,
                        dt, localMatrix, localRhs );
    KERNEL_TYPE::template launch< POLICY >( stencilWrapper.size(), kernel );
  }
};
 
} // namespace stabilizedSinglePhaseFVMKernels
 
} // namespace geos
 
 
#endif //GEOS_PHYSICSSOLVERS_FLUIDFLOW_SINGLEPHASE_STABILIZEDFLUXCOMPUTEKERNEL_HPP